• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Poly(vinyl acetal)membrane for pervaporation of benzene-isooctane solution
【24h】

Poly(vinyl acetal)membrane for pervaporation of benzene-isooctane solution

机译：聚乙烯醇缩醛膜用于苯-异辛烷溶液的全蒸发

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Separation of aromatic-aliphatic mixture is one of the challenging tasks in chemical industries.In this work,an attempt has been made to recover benzene from binary mixture of benzene and isooctane through pervaporation(PV)using a laboratory-made dense,non-porous(homogeneous)membrane from poly(vinyl acetal).The membrane was characterized by FTIR,X-ray diffraction(XRD)and sorption test.The solution-diffusion model was used to elucidate the mass transfer mechanism that occurs within the membrane during pervaporation process.It was observed that the separation behavior is not due to molecular sieving;instead,it appears to be due to preferential sorption(sorption on external surface,pore entering and sorption in pores)of one species,which prevents the other organic from sorbing and transporting through the membrane.The diffusivity coefficients were estimated using sorption kinetics data and PV results.The preferential permeability of membrane to benzene over isooctane was inferred due to preferential sorption and diffusion of benzene.Further,PV selectivity was also observed to be governed by sorption and/or by diffusion phenomena.Sorption selectivity was observed to be higher than pervaporation selectivity in binary solutions.Further,extent of solvent sorption is greatly influenced with the composition of benzene-isooctane solution.
机译：芳香族-脂肪族混合物的分离是化学工业中的一项艰巨任务。在这项工作中，人们尝试使用实验室制造的致密，无孔的渗透汽化法从苯和异辛烷的二元混合物中回收苯。聚乙烯醇缩醛制得的（均质）膜。通过FTIR，X射线衍射（XRD）和吸附测试对膜进行表征。溶液扩散模型用于阐明渗透蒸发过程中膜内部发生的传质机理观察到分离行为不是由于分子筛;而是由于一种物质的优先吸附（外表面吸附，孔进入和在孔中吸附）而阻止了另一种有机物的吸附和分离。通过吸附动力学数据和PV结果估算扩散系数，归因于p推断出膜对苯的优先于异辛烷的渗透性苯的参考吸附和扩散。此外，PV选择性还受吸附和/或扩散现象控制。在二元溶液中，吸附选择性高于渗透蒸发选择性。此外，溶剂吸附程度受到苯-异辛烷溶液的组成。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号